1,879 research outputs found
Polymer multimode waveguide optical and electronic PCB manufacturing
No full textThe paper describes the research in the £1.3 million IeMRC Integrated Optical and Electronic Interconnect PCB Manufacturing (OPCB) Flagship Project in which 8 companies and 3 universities carry out collaborative research and which was formed and is technically led by the author. The consortium’s research is aimed at investigating a range of fabrication techniques, some established and some novel, for fabricating polymer multimode waveguides from several polymers, some formulations of which are being developed within the project. The challenge is to develop low cost waveguide manufacturing techniques compatible with commercial PCB manufacturing and to reduce their alignment cost. The project aims to take the first steps in making this hybrid optical waveguide and electrical copper track printed circuit board disruptive technology widely available by establishing and incorporating waveguide design rules into commercial PCB layout software and transferring the technology for fabricating such boards to a commercial PCB manufacturer. To focus the research the project is designing an optical waveguide backplane to tight realistic constraints, using commercial layout software with the new optical design rules, for a demonstrator into which 4 daughter cards are plugged, each carrying an aggregate of 80 Gb/s data so that each waveguide carries 10 Gb/s
Political Obligation: A Critical Introduction
No full textPolitical obligation is concerned with the clash between the individual’s claim to self-governance and the right of the state to claim obedience. It is a central and ancient problem in political philosophy.
In this authoritative introduction, Dudley Knowles frames the problem of obligation in terms of the duties citizens have to the state and each other. Drawing on a wide range of key works in political philosophy, from Thomas Hobbes, John Locke, David Hume and G. W. F. Hegel to John Rawls, A. John Simmons, Joseph Raz and Ronald Dworkin, Political Obligation: A Critical Introduction is an ideal starting point for those coming to the topic for the first time, as well as being an original and distinctive contribution to the literature.
Knowles distinguishes the philosophical problem of obligation - which types of argument may successfully ground the legitimacy of the state and the duties of citizens - from the political problem of obligation - whether successful arguments apply to the actual citizens of particular states.
Against the anarchist and modern skeptics, Knowles claims that a plurality of arguments promise success when carefully formulated and defended, and discusses in turn ancient and modern theories of social contract and consent, fairness and gratitude, utilitarianism, justice and a Samaritan duty of care for others. Against modern communitarians, he defends a distinctive liberalism: 'the state proposes, the citizen disposes'
Large-scale instabilities in a STOVL upwash fountain
No full textProceedings of the 2005 ERCOFTAC International Symposium on Engineering Turbulence Modelling and Measurements; ETMM6, 23–25 May Sardinia, ItalyThe fountain flow created by two underexpanded axisymmetric, turbulent jets
impinging on a ground plane was studied through the use of laser-based
experimental techniques. Velocity and turbulence data were acquired in the jet
and fountain flow regions using laser doppler velocimetry and particle image
velocimetry. Profiles of mean and rms velocities along the jet centreline are
presented for nozzle pressure ratios of two, three and four. The unsteady nature
of the fountain flow was examined and the presence of large-scale coherent
structures identified. A spectral analysis of the fountain flow data was
performed using the Welch method. The results have relevance to ongoing studies
of the fountain flow using large eddy simulation techniques
G.W.F. Hegel
No full textHegel is notable for his distinctive contribution to the perennial concerns of political philosophy. He outlines a powerful account of freedom as both a personal and social achievement, discussing theories of personal rights, private property and punishment. He articulates a social analysis of human action and criticizes Kantian ethics. His theory of self-actualization locates our social identities within 'Ethical Life' - the institutions of family life, civil society and the state - expressing a unique variety of rationalist conservatism. In this volume some of the finest interpreters of Hegel writing in English explore this distinguished heritage and explain its contemporary relevance
G.W.F. Hegel
No full textHegel is notable for his distinctive contribution to the perennial concerns of political philosophy. He outlines a powerful account of freedom as both a personal and social achievement, discussing theories of personal rights, private property and punishment. He articulates a social analysis of human action and criticizes Kantian ethics. His theory of self-actualization locates our social identities within 'Ethical Life' - the institutions of family life, civil society and the state - expressing a unique variety of rationalist conservatism. In this volume some of the finest interpreters of Hegel writing in English explore this distinguished heritage and explain its contemporary relevance
The Chance and Probability Concepts Project
No full textThis article, created by D.R. Green, describes an investigation of what concepts and intuitions concerning random processes are present in the minds of children of varying abilities across the 11-16 age range. The ability to list permutations, combinations and arrangements is also being investigated. The author states, "Over the past two decades the topic of 'Probabilityâ has been brought into the mathematics curriculum but it may be that this is more an empty gesture rather than a sound strategy." This article can help to alleviate many of the struggles in teaching probability concepts. The article is pitched at a more elementary audience, but is still a perfect resource for almost anyone teaching in the field
Achieving 10 ps coincidence time resolution in TOF-PET is an impossible dream
No full textGreen Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.RST/Radiation, Science and TechnologyRST/Medical Physics & Technolog
Routledge Philosophy Guidebook to Hegel and the Philosophy of the Right
No full textHegel is one of the most important figures in the history of ideas and political thought. His Philosophy of Right is widely recognised as one of the greatest works of political philosophy.
Hegel and the Philosophy of Right introduces and assesses:
* Hegel's life and the background of the Philosophy of Right
* The ideas and text of the Philosophy of Right
* The continuing importance of Hegel's work to philosophy and political thought
Bepalen van het massatraagheidsmoment met behulp van een bifilar pendulum: Determining the moments of inertia using a bifilar pendulum
No full textThe aim of this thesis is to investigate the use of a bifilar pendulum for determining the moments of inertia of the TU Delft solar boat and to quantitatively predict the estimates. In the first part, several methods are discussed which can be applied in deriving the equations of motion of the pendulum. A new method, Kane's method, will be introduced. In the second part, this method will be used to derive the actual equations of motion. These equations are linearized around of the the pendulum's stationary positions to obtain expressions which link the moment of inertia about an axis to the period of oscillation of the pendulum about that axis. These equations are subsequently applied to the solar boat to derive estimates for the moments of inertia about the principle axis of the boat. The results of this thesis considers three different configurations of the bifilar pendulum with the solar boat suspended. One of these configurations results in the most accurate estimates for the moments of inertia, however, these have not been quantitatively predicted. The author suggests a modification in the definition of the bifilar pendulum such that this might be possible.Electrical Engineering, Mathematics and Computer ScienceNumerical analysi
Photographic Fluid Velocity Measurement in a Hydrocyclone
No full textThe three dimensional flow patterns in a 3 inch diameter hydrocyclone operating without an air core were studied usina tracer particles and high speed cine photography. The cyclone was constructed and operated according to present design criteria for the optimum separation of Liquid-solid mixtures. Both cyclone geometry and operating conditions were the same throughout al I experiments analysis of fi Ims posed at 55 locations inside the hydrocyclone provided data for 18 velocity profi les which described the three dimensional flow in the hydrocyclone. This data was then checked for consistency by material balance considerations and compared with the results of earlier investigators who operated their cyclones with air cores.Master of Engineering (MEngr
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